Solvent composition and method of cleaning lubricated apparatus



a relatively low percentage of benzol and hav minimum flash point of 115F.

, Patented Jan. 11, 1944 moo STA-TEAS PATENT orrics SOLVENT COMPOSITION-AND METHOD OF' CLEANING LUBRIGATED APPARATUS John 1). Morgan, Southrange,-N. 1., assi'gnor to Cities Service Oil Company; New York, N. Y.,a

corporation of Pennsylvania.

No Drawing. Application May 22, 1941,

- Serial No. 394,629

e Claims. (01. 252-471) This invention relates to improvements insolvent compositions and in methods of cleaning lubricated apparatus.More particularly the invention relates to solvent compositions for andmethod for cleaning internal combustion motors.

. This application isa continuation-in-part of the applicants pendingapplication Serial No. 307,585, filed December 5, 1939 (now Patent No.2,301,918, granted November 17, 1942) for-"Flushing oil, and covers animprovement in the composition disclosed therein.

This pending application covers a flushing oil composition and themethod of cleaning bearing surfaces which are commonly lubricated by oilor grease, the cleaning operation to be carried out while the movingparts of the apparatus are bon and dirt which accumulates in an engine,and therefore assists in effectively flushing out foreign material inthe crank case E The small proportion or the octyl alcohol is used toprevent irothing in washing the engine, and the sulfurlzed phosphite andphosphate are employed as extreme pressure lubricants to lubricate thmoving parts while they are being cleaned. The phosphite-phosphatemixture furin motion. The preferred composition disclosed in thispending application is as follows: 3

Present by volume Commercial xylol l0 Q No. 2 fuel oil 88.9 Octylalcohol 0.1 Sulfurized cresyl phosphite 0.5 Sulfurized cresyl phosphate0.5 5

To over fifty gallons of this mixture, two grams of a red organic dyeare added in order togive a distinctive color to the mixture.

According to the further disclosure of the pend-5 ing application thecommercial xylol is a good solvent for varnishes, gums and resins whichare often formed in' the crank case and around the piston rings of anautomobile engine. The xylol has good penetrating properties and adesirable surface tension to assist in dissolving gums, resins and thelike in a crank case, and should contain a The fuel oil referredto aboveisdescribedas preferably comprising a mineral oil which is a goodsolvent for asphalts, mineral residues and reaction products of mineraloils which are deposited in the. crank case from lubricating oils,

and gasoline which may dilute the lubricating oil in the operation ofthe engine. properties for this fuel oil are:

F. Minimum flash point Maximum flash point On Engler distillation:

10% over at .o.... 440 90% over at aximum" 600 Pour point I 15 A fueloil-or this type in addition to being a good solvent is an excellentcarrier for emulsions, car

The preferredpistons and motors.

thermore has the property to clean and displace undesired residues whichare deposited in bear-' in s.

The primary \object of the present invention is to provide an improvedsolvent composition which may be used in accordance with the disclosureof the above-mentioned pending application, but which is especiallyuseful for the removal of gums, residues and carbonaceous deposit whichform on the valves and piston rings of internal combustion motors, 1

Another object of the invention is to provide im- I Kerosene 16 xylene16 Secondary butyl alcohol 16 Light lubricating oil 50 Extrem pressurelubricant base (consisting of equal parts of #2 furnace oil and a cresylphosphite ondensation product containing one half uivalent of combinedsulfur) 2 This composition is particularly useful for loosening the gumsand resins and similar varnish-dike materials which collect on thevalves. piston rings of internal combustion One method of utilizing thesolvent composition is to remove the spark plugs from the motor and pourapproximately two ounces of the solvent into each spark plug hole andlet the motor stand in this condition from'two to twelve hours, afterwhich the spark plugs are replaced and the motor run for ten minutesuntil the color ofthe exhaust becomes normal. The loosened gum and caraa light mineral lubricating oil, and approximately 1% or a condensationproduct of tricresyl phos- Dhite molecules with about one-half atomicequivalent of sulfur, said percentages being by volume.

2. A solvent composition for loosening and removing gums, resins andcarbonaceous matter from the valves, pistons and other lubricated partsof internal combustion motors, comprising approximately of kerosene, 15%of xylene, 15% of secondary butyl alcohol, 50% of a light minerallubricating oil and from 1 to 5% of a condensation product .01 organicphosphite molecules with from one-half to three atomic equivalents ofsulfur, said percentages being by volume. 3. A solvent composition asdefined by claim 2 in which said organic phosphite is a phenolic.

phosphite.

4. A solvent composition as defined by claim 2 in which said phosphiteis an aryl phosphite. 5. A solvent composition as defined by claim 2 inwhich said organic phosphite is a halogenated organic phosphite.

6. The method of loosening and removing resins and carbonaceous residuesfrom the valves and pistons of an internal combustion motor,

which comprises introducing into the cylinders.

of the motor a solvent mixture comprising approximately 15% of kerosene,15% of xylene, 15%

of secondarybutyl alcohol, 50% of light mineral lubricating oil and from1 to 5% of a condensation reaction product of tricresyl phosphite .andsulfur, the percentages being by volume.

7. An improved solvent composition forloosening and removing gums,resins and carbonaceous materials from the relatively moving parts ofapparatus comprised essentially of from 8 to 16% kerosene, from 8 to 16%xylene, from 16 to 32% being cleaned, comprising from 15 to 32% byvolume of secondary butyl alcohol, approximate-- 1y 15% each of xyleneand kerosene by volume,

most of the remainder of the composition being a light minerallubricating oil, and from 1% to 5% of an extreme pressure lubricatingagent consisting essentially of a condensation product of organicphosphite molecules chemically linked to sulfur. 4

9. A solvent composition for cleaning gums, resins and carbonaceousmatter from the surfaces of lubricated apparatus such as the pistons andvalves of internal combustion engines, comprising from 8% to 16% each byvolume of kerosene and xylene,'from 16% to 32% by volume of secondarybutyl alcohol, from about 1% to 5% by volume of a sulfurized, organicphosphite as a plasticizing 'agent, the remainder of the compositionbeinga light mineral lubricating oil.

10. 'I'he method of loosening and removing resins and carbonaceousresidues from the valves secondary butyl alcohol, approximately lightwhich comprises introducing into the cylinders of the motor a solventmixture comprising from 8% to 16% each by volume of kerosene and xylene,from 16% to 32%.by volume of secondary, butyl alcohol, from 1 to 5% byvolume of a sulfurized organic phosphite as a plasticizing agent. theremaining "portion of the mixture being a light mineral lubricating oil.

JOHN D. f MORGAN.

